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Diffstat (limited to 'drivers/hwmon/lm90.c')
-rw-r--r--drivers/hwmon/lm90.c106
1 files changed, 62 insertions, 44 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 618052c6cdb6..74019dff2550 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -35,13 +35,14 @@
* explicitly as max6659, or if its address is not 0x4c.
* These chips lack the remote temperature offset feature.
*
- * This driver also supports the MAX6654 chip made by Maxim. This chip can
- * be at 9 different addresses, similar to MAX6680/MAX6681. The MAX6654 is
- * otherwise similar to MAX6657/MAX6658/MAX6659. Extended range is available
- * by setting the configuration register accordingly, and is done during
- * initialization. Extended precision is only available at conversion rates
- * of 1 Hz and slower. Note that extended precision is not enabled by
- * default, as this driver initializes all chips to 2 Hz by design.
+ * This driver also supports the MAX6654 chip made by Maxim. This chip can be
+ * at 9 different addresses, similar to MAX6680/MAX6681. The MAX6654 is similar
+ * to MAX6657/MAX6658/MAX6659, but does not support critical temperature
+ * limits. Extended range is available by setting the configuration register
+ * accordingly, and is done during initialization. Extended precision is only
+ * available at conversion rates of 1 Hz and slower. Note that extended
+ * precision is not enabled by default, as this driver initializes all chips
+ * to 2 Hz by design.
*
* This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
* MAX6692 chips made by Maxim. These are again similar to the LM86,
@@ -188,6 +189,8 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
#define LM90_HAVE_EXTENDED_TEMP (1 << 8) /* extended temperature support*/
#define LM90_PAUSE_FOR_CONFIG (1 << 9) /* Pause conversion for config */
+#define LM90_HAVE_CRIT (1 << 10)/* Chip supports CRIT/OVERT register */
+#define LM90_HAVE_CRIT_ALRM_SWP (1 << 11)/* critical alarm bits swapped */
/* LM90 status */
#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
@@ -197,6 +200,7 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
+#define LM90_STATUS_BUSY (1 << 7) /* conversion is ongoing */
#define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */
#define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */
@@ -354,38 +358,43 @@ struct lm90_params {
static const struct lm90_params lm90_params[] = {
[adm1032] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
- | LM90_HAVE_BROKEN_ALERT,
+ | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 10,
},
[adt7461] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
- | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP,
+ | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP
+ | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 10,
},
[g781] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
- | LM90_HAVE_BROKEN_ALERT,
+ | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 8,
},
[lm86] = {
- .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
+ .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
+ | LM90_HAVE_CRIT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[lm90] = {
- .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
+ .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
+ | LM90_HAVE_CRIT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[lm99] = {
- .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
+ .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
+ | LM90_HAVE_CRIT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[max6646] = {
+ .flags = LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 6,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
@@ -396,50 +405,51 @@ static const struct lm90_params lm90_params[] = {
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6657] = {
- .flags = LM90_PAUSE_FOR_CONFIG,
+ .flags = LM90_PAUSE_FOR_CONFIG | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6659] = {
- .flags = LM90_HAVE_EMERGENCY,
+ .flags = LM90_HAVE_EMERGENCY | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6680] = {
- .flags = LM90_HAVE_OFFSET,
+ .flags = LM90_HAVE_OFFSET | LM90_HAVE_CRIT
+ | LM90_HAVE_CRIT_ALRM_SWP,
.alert_alarms = 0x7c,
.max_convrate = 7,
},
[max6696] = {
.flags = LM90_HAVE_EMERGENCY
- | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
+ | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3 | LM90_HAVE_CRIT,
.alert_alarms = 0x1c7c,
.max_convrate = 6,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[w83l771] = {
- .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
+ .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 8,
},
[sa56004] = {
- .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
+ .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT,
.alert_alarms = 0x7b,
.max_convrate = 9,
.reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
},
[tmp451] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
- | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP,
+ | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 9,
.reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
},
[tmp461] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
- | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP,
+ | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP | LM90_HAVE_CRIT,
.alert_alarms = 0x7c,
.max_convrate = 9,
.reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
@@ -668,20 +678,22 @@ static int lm90_update_limits(struct device *dev)
struct i2c_client *client = data->client;
int val;
- val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT);
- if (val < 0)
- return val;
- data->temp8[LOCAL_CRIT] = val;
+ if (data->flags & LM90_HAVE_CRIT) {
+ val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT);
+ if (val < 0)
+ return val;
+ data->temp8[LOCAL_CRIT] = val;
- val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
- if (val < 0)
- return val;
- data->temp8[REMOTE_CRIT] = val;
+ val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
+ if (val < 0)
+ return val;
+ data->temp8[REMOTE_CRIT] = val;
- val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST);
- if (val < 0)
- return val;
- data->temp_hyst = val;
+ val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST);
+ if (val < 0)
+ return val;
+ data->temp_hyst = val;
+ }
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
if (val < 0)
@@ -809,7 +821,7 @@ static int lm90_update_device(struct device *dev)
val = lm90_read_reg(client, LM90_REG_R_STATUS);
if (val < 0)
return val;
- data->alarms = val; /* lower 8 bit of alarms */
+ data->alarms = val & ~LM90_STATUS_BUSY;
if (data->kind == max6696) {
val = lm90_select_remote_channel(data, 1);
@@ -1160,8 +1172,8 @@ static int lm90_set_temphyst(struct lm90_data *data, long val)
else
temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
- /* prevent integer underflow */
- val = max(val, -128000l);
+ /* prevent integer overflow/underflow */
+ val = clamp_val(val, -128000l, 255000l);
data->temp_hyst = hyst_to_reg(temp - val);
err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
@@ -1192,6 +1204,7 @@ static const u8 lm90_temp_emerg_index[3] = {
static const u8 lm90_min_alarm_bits[3] = { 5, 3, 11 };
static const u8 lm90_max_alarm_bits[3] = { 6, 4, 12 };
static const u8 lm90_crit_alarm_bits[3] = { 0, 1, 9 };
+static const u8 lm90_crit_alarm_bits_swapped[3] = { 1, 0, 9 };
static const u8 lm90_emergency_alarm_bits[3] = { 15, 13, 14 };
static const u8 lm90_fault_bits[3] = { 0, 2, 10 };
@@ -1217,7 +1230,10 @@ static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val)
*val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1;
break;
case hwmon_temp_crit_alarm:
- *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1;
+ if (data->flags & LM90_HAVE_CRIT_ALRM_SWP)
+ *val = (data->alarms >> lm90_crit_alarm_bits_swapped[channel]) & 1;
+ else
+ *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1;
break;
case hwmon_temp_emergency_alarm:
*val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1;
@@ -1465,12 +1481,11 @@ static int lm90_detect(struct i2c_client *client,
if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0)
return -ENODEV;
- if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) {
+ if (man_id == 0x01 || man_id == 0x5C || man_id == 0xA1) {
config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2);
if (config2 < 0)
return -ENODEV;
- } else
- config2 = 0; /* Make compiler happy */
+ }
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x01) { /* National Semiconductor */
@@ -1903,11 +1918,14 @@ static int lm90_probe(struct i2c_client *client)
info->config = data->channel_config;
data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
- HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
- HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM;
+ HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM;
data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
- HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
- HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
+ HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | HWMON_T_FAULT;
+
+ if (data->flags & LM90_HAVE_CRIT) {
+ data->channel_config[0] |= HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_CRIT_HYST;
+ data->channel_config[1] |= HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_CRIT_HYST;
+ }
if (data->flags & LM90_HAVE_OFFSET)
data->channel_config[1] |= HWMON_T_OFFSET;
generated by cgit (git 2.34.1) at 2024-04-19 21:38:52 +0000